Electromagnetic Radiation

PIRA classification 5N

Grayed Demos are either not available or haven't been built yet

Please note that these tables have not yet been edited to match the equipment that is available within the UW-Madison lecture demo lab. There maybe many items listed within these tables that we either "can not do" or have available.

5N10. Transmission Lines and Antennas

PIRA #

Demonstration Name

Abstract

5N10.10

transmission of power

Five 200 W bulbs connected in series along resistance wire.

5N10.10

model transmission line - lamps

Six lamps are connected across two thin wires strung along the lecture bench.

5N10.10

voltage drop

Voltages are measured successively across four 300 W bulbs.

5N10.13

drift velocity

Move a Hall specimen perpendicular to the magnetic field in the opposite direction to the drift motion of carriers with exactly the drift velocity compensates for the Hall voltage.

5N10.15

HV line model

5N10.15

H.T. transmission

A model transmission line with a lamp for a load that shows a loss unless transformers are used to boost voltage up and back.

5N10.16

power loss in transmission line

A circuit demonstrates that the efficiency of power transmission increases with increased voltage. Variac, light bulb bank, meters, line resistance. Reference: AJP 21(2),110.

5N10.20

model transmission line - phase

A model transmission line is made of a series of sixty series inductors and shunt capacitors. An oscilloscope is used to show delay times and phase relationships.

5N10.21

wave propagation

A demonstration of wave propagation in a toroidal transmission line with periodic variation of the wave phase velocity around the line.

5N10.22

wave propagation in aluminum

Show amplitude decay and change in phase for waves propagating through an aluminum wedge or large sheet.

5N10.25

dispersion in non-inductive cable

A model cable made of 150 series resistors and parallel capacitors shows delay and dispersion with meters at each end.

5N10.26

dispersion circuit

A set of T filters with the input and output impedances matched are used to show dispersion of a short pulse.

5N10.27

dispersion of an EM pulse

A microwave demonstration where as a sine wave burst is generated and the dispersion is observed in a slotted line waveguide with a sampling scope.

5N10.30

reflections in a coax

5N10.30

propagation in a coax

A circuit using a wetted-contact mercury relay gives a pulse with a very fast rise time.

5N10.30

pulses on a coax

Reflections in a coax using the Tektronix 545A delayed trigger.

5N10.30

propagation velocity in coax

Using a square wave generator and oscilloscope, propagation time in 1', 20', and 40' of coax are compared. Diagrams

5N10.40

reflections in a coax

5N10.50

Lecher wires

A 80 MHz generator is coupled to a long transmission line and standing waves are demonstrated with neon and filament lamp probes.

5N10.50

Lecher wires

Standing waves are set up on parallel wires from an 80 MHz generator.

5N10.50

Lecher wires

Standing electromagnetic waves are coupled from an UHF oscillator to parallel wires.

5N10.50

Lecher wires

Standing waves are generated on parallel wires by a radio transmitter. An incandescent bulb placed across the wires indicates voltage maxima.

5N10.52

Lecher bars

Two six foot iron rods are used in a Lecher system with a fluorescent lamp detector.

5N10.55

microwave standing waves

Measure the wavelength of a microwave transmitter by using a movable mirror to set up standing waves.

5N10.55

microwave standing waves

Standing waves are set up between a microwave transmitter and a metal sheet. The receiver is moved between the two and the signal strength is displayed on a LED bar graph.

5N10.60

radiation from a dipole

A flashlight bulb on a dipole detects radiation from an 80Mhz generator.

5N10.60

radio waves

Show radiation with a 100 MHz dipole transmitter and hand held dipole receiver with a flashlight bulb detector.

5N10.61

radiation and polarization

Polarization of radiation from a dipole antenna is checked with a hand-held dipole antenna with lamp indicator.

5N10.63

dipole radiation computer simulation

R.H Good report on his Apple II dipole radiation simulation. Excellent and free.

5N10.65

directional antenna

A directional antenna for use with a UHF oscillator.

5N10.70

waveguide normal modes

Morie pattern type demonstration of normal modes in a waveguide.

5N10.80

EM vectors

A dynamic model for demonstrating electric and magnetic vectors in an electromagnetic field. Picture, Diagrams.

5N20. Tesla coil

PIRA #

Demonstration Name

Abstract

5N20.10

induction coil

The small handheld induction coil.

5N20.12

induction coil

A small Cenco induction coil.

5N20.13

induction coil

All sorts of stuff on induction coils - producing high voltage from a DC source.

5N20.15

spark coil

A discussion of the construction of a large spark coil and the effects of reversing polarity.

5N20.25

hand held Tesla and lamp

Light a fluorescent lamp by touching with a hand held tesla coil.

5N20.25

hand held tesla and lamp

5N20.40

Tesla coil

1,000,000. Volt tesla coil.

5N20.41

continuous wave Tesla coil

A tesla coil is coupled to an oscillator coil from A-32 or A-36.

5N20.42

Tesla coil

Directions for building a Tesla coil and many demonstrations possible with it are described.

5N20.43

Tesla coil

Directions for building a Tesla coil (Oudin coil when one end is grounded) that will give a thirty inch spark.